There's a chance that a monkey randomly hitting keys on a keyboard will write the novel "War and Peace" perfectly on the first try. Similarly, you can play Heroes every day and easily level up a warrior-mage (attack, defense, leadership, logistics) without any problems. But the chance of such incredible luck (or bad luck?) is very small. I mean, you're just lucky when you find him. Lately, I haven't been lucky with leveling up the summoner in the Necromancer Castle, and there's only a 10% chance.
By the way, tell me, does anyone need Light in the early stages of the game, and why? I think it would be good to get only mass haste and regeneration for now. You need to develop the Castle for troops, and develop the guild later.